Method and systems for provision of a simulation model of an electric rotating machine

ABSTRACT

A computer-implemented method for providing a simulation model of an electric rotating machine is disclosed. The simulation model is defined by parameter values. Input data is obtained. The input data is collectable using the electric rotating machine when the electric rotating machine is not connected to an operating voltage and being characteristic of the electric rotating machine. The parameter values are determined from the input data using a trained function and the parameter values determined are provided.

CROSS-REFERENCES TO RELATED APPLICATIONS

This application is a continuation of prior filed copending U.S.application Ser. No. 17/923,842, filed Nov. 7, 2022, the priority ofwhich is hereby claimed under 35 U.S.C. § 120, and which is the U.S.National Stage of International Application No. PCT/EP2021/060340, filedApr. 21, 2021, which designated the United States and has been publishedas international Publication No. WO 2021/224003 A1 and which claims thepriority of European Patent Application, Serial No. 20173646.9, filedMay 8, 2020, pursuant to 35 U.S.C. 119(a)-(d).

The contents of U.S. application Ser. No. 17/923,842, InternationalApplication No. PCT/EP20211060340 and European Patent Application,Serial No. 20173646.9 are incorporated herein by reference in theirentireties as if fully set forth herein.

BACKGROUND OF THE INVENTION

The invention relates to a computer-implemented method for provision ofa trained function.

What is more the invention relates to a computer-implemented method forprovision of a simulation model of an electric rotating machine usingthe above-mentioned trained function, wherein the simulation model isdefined by parameter values.

Above and beyond this the invention relates to computer programs thatcomprise corresponding commands and, when the corresponding program isexecuted by a computer, that cause said commands to carry out the oneand/or the other method mentioned above.

In addition the invention relates to a sensor apparatus with acomputer-readable medium that has a further simulation model, which isbased on the above-mentioned simulation model.

Furthermore the invention relates to a data carrier signal thattransmits the above-mentioned simulation model and/or theabove-mentioned computer program(s).

What is more the invention relates to a method for linkage of anelectric rotating machine to a platform, preferably to a softwareplatform, in particular to a Cloud platform and to a method fordetermining the operating behavior of an electric rotating machineconnected to an operating voltage and for example linked to a platform.

Above and beyond this the invention relates to an arrangement fordetermining the operating behavior of an electric rotating machineconnected to an operating voltage, wherein the arrangement comprises asensor apparatus and a processing facility.

Onboarding of new assets in the context of a digitalization of industryproceeding at an ever increasing pace represents an important aspect.The field devices, machines, software etc. are generally referred to asassets at the level of the system part.

For digitalization of older industrial plants the problem that is oftenencountered is that the information about the machines, e.g. aboutelectric rotating machines, in particular about asynchronous machines,for example asynchronous motors and generators, in the system is notadequate for creating a sufficiently exact simulation model of themachine and for example for carrying out the onboarding or determiningoperating points of the machines.

Even if an equivalent circuit (a simulation model) of an asynchronousmotor is known (“greenfield”), it is often difficult to determine itsoperating behavior. One possible solution to this “greenfield” problemis proposed in the applicant's EP 20 173 618.8, of which the content ishereby incorporated into the subject matter of this application. Oftencomplex measurements by means of expensive sensors are needed for this.

With many motors, from older ranges for example, there is notinfrequently even less information available. The information is oftenrestricted just to data (“brownfield”) that is to be found on a typeplate (rating plate).

One possible approach for dealing with the problem and determining theoperating behavior is to switch to simpler methods (e.g. linearinterpolation). These however suffer from marked imprecision andmoreover merely supply information about the torque, but not moredetailed specifications however, such as e.g. efficiency and powerfactor.

The object of the present invention can thus be seen as provision of asimulation model of an electric rotating machine and for example makingpossible the onboarding of the electric rotating machines using just alittle available information and, in doing so, to dispense withexpensive measurements, such as e.g. measurements when idling (e.g. coldresistance measurement) in conjunction with rotating measurements whenrunning under no load (electromotive series) and under load (loadseries).

SUMMARY OF THE INVENTION

The object is achieved in accordance with the invention with acomputer-Implemented method for provision of a simulation model of anelectric rotating machine of the said type, wherein the simulation modelis defined by parameter values by

-   -   input data being obtained, wherein the input data is able to be        collected using the machine in a state not connected to an        operating voltage and is characteristic of the machine and        comprises a shaft height, a number of pole pairs and rating        plate specifications of the electric rotating machine,    -   the parameter values are determined from the input data with the        help of a trained function, wherein    -   the trained function is provided according to a method given        below, wherein based on the shaft height and the number of pole        pairs the trained function determines loss and stray        coefficients, wherein    -   the parameter values are determined from the loss and stray        coefficients and rating plate specifications determined,    -   the parameter values determined are provided.

In connection with the present invention the term “with the help of” isto be understood as the determination of the parameter values being ableto comprise a number of substeps, wherein the trained function F doesnot have to be applied in each substep. For example the method can havesubsteps that can be carried out with the aid of analytical mathematicalformulae. This can be of advantage in respect of processing time.

In connection with the present invention the term “connected to anoperating voltage” can be understood as a state of the electric rotatingmachine in which the machine is connected to an operating voltageconstant in level and frequency (constant voltage network) or variable(converter operation).

Preferably the control method of the converter is known, whereby theunknown converter output voltage can be determined from the frequency f₁determined by sensors.

In one form of embodiment there can be provision for the simulationmodel to be embodied as the equivalent circuit diagram.

It is also conceivable for the simulation model to be present in theform of coherent equations or In tabular form.

In one form of embodiment there can be provision for the trainedfunction to be based on a neural network, on a regression, preferably ona multivariate regression.

Above and beyond this there can advantageously be provision for theinput data to be subjected to a plausibility check.

In one form of embodiment there can be provision for the input data toconsist of rating plate specifications.

In this case there can be provision for a part of the parameter valuesto be determined by the rating plate specifications. This enables themethod to be simplified by values of specific parameters being computeddirectly from the rating plate specifications.

It is entirely conceivable for the input data merely to consist of theshaft height and the number of pole pairs. Good results can be obtainedwith such input data.

The advantage of a multivariate regression and in particular also thatof a neural network lies in the fact that the training input data doesnot have to be restricted and also does not have to be explicitly soughtout. This is especially advantageous when the input data comprises morethan two input variables (e.g. shaft height and number of pole pairs),for example a plurality of input variables and the neural network issupplied with the input variables in order to determine the simulationmodel parameters.

What is more the object is inventively achieved with acomputer-implemented method for provision of a trained function of thesaid type by

-   -   training input data being obtained that is        characteristic/representative of electric rotating machines and        is able to be collected using the machines in a state not        connected to an operating voltage, wherein the training input        data comprises shaft heights and number of pole pairs,    -   training output data being obtained that is representative of        parameter values and comprises loss and stray coefficients,        wherein the parameter values define simulation models of the        electric rotating machines,    -   a function being trained based on the training input data and        the training input data,    -   the trained function being provided.

In one form of embodiment there can be provision for a training dataset,which comprises training input and training output data, to be able tobe preprocessed before the function is trained on the training dataset.The preprocessing can for example comprise bringing the data into arelative and normalized form.

It can be expedient for the function to be based on a regression,preferably on a multivariate regression.

The function can also be based on a neural network, so that theabove-mentioned trained function can likewise be based on a neuralnetwork.

What is more the object is inventively achieved with a first computerprogram, by the first computer program comprising commands that, whenthe program is executed by a computer, cause said computer to determinethe simulation model parameter values.

The computer program thus obtains input data as input and outputssimulation model parameter values as output. Since the simulation modelis defined by the simulation model parameter values the expressionsprovision of a simulation model or determination of the simulation modelparameter values can be used equally well.

The object is also inventively achieved with a second computer programthat comprises computer program commands that, when the program isexecuted by a computer, cause said computer to provide the trainedfunction.

The first and/or the second computer program can be stored on acomputer-readable medium or be transmitted with a data transmissionsignal, e.g. in an encoded form.

In addition, the object of the invention is inventively achieved with amethod for linkage of an electric rotating machine to a platform,preferably a software platform, in particular a Cloud platform of thesaid type, by

-   -   input data, which comprises a shaft height, a number of pole        pairs and rating plate specifications of the machine, being        collected using the machine in a state not connected to an        operating voltage, wherein the input data is characteristic of        the machine and is entered as input for configuration        application software, wherein    -   the configuration application software transfers the input data        to the platform, wherein the platform comprises commands that        bring about the execution of the above-mentioned method by the        platform for provision of a simulation model of the electric        rotating machine, wherein    -   preferably the simulation model is transferred to the        configuration application software, wherein the configuration        application software transmits the simulation model to a sensor        apparatus arranged on the machine, preferably fastened to it.

Furthermore, the object of the present invention is inventively achievedwith a method for determining the operating behavior of an electricrotating machine connected to an operating voltage and for examplelinked to a platform by

-   -   A) a stray magnetic field outside the machine being detected,    -   B) a slip frequency f₂ and a synchronous frequency or        synchronous speed f₁ being computed from the detected stray        magnetic field,    -   C) a slip s being computed from the slip frequency f₂ and the        synchronous frequency or synchronous speed f₁,    -   D) a simulation model being provided according to the        above-mentioned method,    -   E) operating behavior of the machine and in particular its        operating point being determined using the slip s, the        synchronous frequency f₁ and the simulation model provided.

In addition the object of the present invention is inventively achievedwith an arrangement of the said type by the sensor apparatus beingembodied to detect a stray magnetic field outside the machine and tocompute a slip frequency f₂ and a synchronous frequency f₁ from thedetected stray magnetic field and to transfer this to the processingfacility, wherein a simulation model provided in accordance with theabove-mentioned method is stored on the processing facility and theprocessing facility is configured, using the computed slip frequency f₂and synchronous frequency f₁, to determine a slip s and subsequently theoperating behavior of the machine by means of the simulation model.

BRIEF DESCRIPTION OF THE DRAWING

The invention will be described and explained in greater detail belowwith the aid of the exemplary embodiments shown in the figures. In thefigures:

FIG. 1 shows a flow diagram of a computer-implemented method forprovision of an equivalent circuit diagram,

FIG. 2 to FIG. 4 show possible equivalent circuit diagrams,

FIG. 5 shows a flow diagram of a computer-implemented method forprovision of a trained function,

FIG. 6 shows an industrial IT environment, and

FIG. 7 shows a flow diagram of a method for determining the operatingbehavior of an electric rotating machine.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Elements that are the same or that act in the same way can each beprovided with the same reference characters in the exemplary embodimentsand figures.

The reader is first referred to FIG. 1 . Shown in FIG. 1 as a flowdiagram is a form of embodiment of a computer-implemented method forprovision of a simulation model of an electric rotating machine 2.Equivalent circuit diagrams EC1, EC2, EC3 are considered below as anexample of the simulation model. Use of other simulation models, such ase.g. simulation models in the form of coherent equations or in tabularform, is likewise possible.

The equivalent circuit diagram EC1, EC2, EC3 is defined by values ofpredetermined parameters. FIG. 2 to 4 show examples of differentequivalent circuit diagrams EC1, EC2, EC3. FIG. 2 relates to aT-equivalent circuit diagram EC1, FIG. 3 —a T-equivalent circuit diagramEC2 with separated rotor resistance, which is equivalent in value to theT-equivalent circuit diagram of FIG. 2 and FIG. 4 —an expandedequivalent circuit diagram EC3 with the following parameters: Maininductance X_(h) (main flux), stator X₁ and rotor inductance X′₂ (strayfluxes), rotor resistance R′₂ (rotor winding losses), stator resistanceR₁ (stator winding losses), R_(fe) (iron losses) and R_(zus) (additionallosses).

Without restricting the scope of the present disclosure and for the sakeof simplicity of the representation, the term “equivalent circuitdiagram” below is to be understood as the expanded equivalent circuitdiagram EC3.

In a step S1 of the method input data is obtained. The input data isable to be collected using the machine 2 in a state not connected to anoperating voltage and is characteristic of the machine 2. In this casethe input data can for example be fed in via a first interface into aprocessing facility, e.g. entered as input into a configuration App. Theinput data is the data that identifies the machine 2. The input data forexample comprises rating plate specifications LSA—manufacturerspecifications, standards information, regulatory information etc. thatcharacterizes the machine at the measurement point (with a load of100%). Further input data, which can be collected using thenon-connected machine, but does not have to be specified on its ratingplate for example, is for example number of pole pairs, shaft heightetc.

The method can further comprise a plausibility check of the input data(not shown here). In this it can be checked for example whether level ofefficiency and power factor at the measurement point, when given, leadto a sufficiently small error In the computation of a mechanical ratedpower as a function of rated voltage and rated current.

In a step S2 the parameter values of the equivalent circuit diagram EC3are determined from the input data with the help of a trained functionF.

In connection with the present invention the term “with the help of” isunderstood as the determination of the parameter values being able tocomprise a number of substeps, wherein the trained function F does nothave to be applied in each substep.

FIG. 1 shows a form of embodiment in which step S2 comprises twosubsteps—a first substep S20 and a second substep S21. The first substepS20 can for example be that step in which the trained function F isapplied to at least one part of the input data. This part of the inputdata comprises for example the shaft height and the number of pole pairsof the machine 2. In this case the trained function F can for exampledetermine from the at least one part of the input data loss and straycoefficients for determining the parameter values of the equivalentcircuit EC3 of the machine 2.

The trained function F can for example be based on a regression,preferably on a multivariate regression.

Using the parameters determined in the first substep S20, for examplethe loss and the stray coefficients and the remaining part of the inputdata—the rating plate specifications LSA—in the second substep S21 theparameter values of the equivalent circuit diagram parameters can forexample be determined via other physical variables, preferably with theaid of a predetermined mathematical formula or formulae.

A non-definitive list of the physical variables that can be determinedin step S2, preferably in the second substep S21, preferably calculatedwith the aid of a predetermined mathematical formula or formulae, is:pole pair number, synchronous speed, slip, input power, additionallosses, individual stator winding, iron and friction losses and theirsums, stator resistance, total reactive power, maximum possible straycoefficient etc.

For example, the number of pole pairs, synchronous speed and rated slipcan be determined from rated frequency f_(N) and rated speed n_(N),which can be specified on the type plate. Furthermore, an electricalinput power at a measurement point (operation as motor) is able to becomputed from current, voltage and power factor (each at measurementpoint) or from mechanical output power and efficiency (each likewise atmeasurement point).

The additional losses can be calculated for example in accordance with astandard or a norm, e.g. in accordance with a method according toIEC60034-2-1 or EN60034-2-1.

In a further step S3 the parameter values determined—main inductanceX_(h) (main flux), stator X₁ and rotor inductance X′₂ (stray fluxes),rotor resistance R′₂ (rotor winding losses), stator resistance R₁(stator winding losses), R_(fe) (iron losses) and R_(z) (additionallosses)—can be provided. This can be undertaken for example by means ofoutput via a second interface (see for example FIG. 6 ). For example,the equivalent circuit diagram EC3 with the parameter values determinedcan be stored by storing the parameters in a database 8, for example ina Cloud 4.

FIG. 5 shows a possible form of embodiment of a computer-Implementedmethod for provision of a trained function, for example theabove-mentioned trained function F.

In a step T1 training input data is obtained, for example by means of afirst training interface. Training input data is characteristic orrepresentative of electric rotating machines and is able to be collectedusing the machines in a state not connected to an operating voltage. Thetraining input data comprises shaft heights and number of pole pairs.

In a step T2 training output data, obtained for example by means of thefirst training interface, which is representative of parameter valuesand loss and stray coefficients, is obtained, wherein the parametervalues define the equivalent circuit diagrams of the electric rotatingmachines.

I.e. the training dataset comprises data of those machines for which theequivalent circuit diagram parameter values are already known. Forexample, this can be data of asynchronous machines, e.g. asynchronousmotors or generators, of known types.

The training dataset that comprises training input and training outputdata can be preprocessed before the function is trained on the trainingdataset. The preprocessing can for example comprise bringing the datainto a relative and normalized form.

In a step T3 a function is trained based on the training input data andthe training output data.

In a step T4 the trained function F is provided for example by means ofa second training interface.

The function can for example be based on a regression, preferably amultivariate regression.

The training input data can comprise shaft heights (e.g. 63 mm to 450mm), preferably shaft heights and number of pole pairs (e.g. 2 to 8) andthe training output data loss and stray coefficients. It goes withoutsaying that the method also functions for other shaft heights (e.g. lessthan 63 mm and greater than 455 mm) and number of pole pairs.

The training dataset can thus comprise data from electric rotatingmachines, e.g. from asynchronous machines of the same or similar type,for which a dependence of the equivalent circuit diagram parameters ontheir shaft height or on their shaft height and their number of polepairs is known.

What Is more the trained function can be validated. This can be done forexample in a load range of 50 to 125%.

The training dataset can comprise data of 1000 to 2000 asynchronousmachines of different types.

The function can also be based on a neural network, so that theabove-mentioned trained function F can likewise be based on a neuralnetwork.

Each of the above-mentioned computer-implemented methods can be presentin the form of commands of a computer program, wherein the commands,when the computer program is executed by a computer or in general by adata processing system, cause the computer or the data processing systemto carry out the corresponding method.

The computer program(s) can be stored on a computer-readable medium orbe transmitted with a data carrier signal. This likewise applies to theproducts of the method, i.e. to the equivalent circuit diagram EC1, EC2,EC3 with the parameter values determined and to the trained function F,which can be stored on a computer-readable medium or transmitted with adata carrier signal.

FIG. 6 shows an industrial IT environment 1, in which one form ofembodiment of the method for linkage or for onboarding of newassets—here of an electric rotating machine 2—to a platform 3 can becarried out. The platform can be embodied for example as a softwareplatform, and in particular as a platform 3 based in a Cloud 4—a Cloudplatform 3. The Cloud can for example be designed as an IoT, inparticular as an IIoT Cloud 4.

The Cloud platform 3 can comprise one or more computing units. The Cloudplatform 3 can for example comprise the above-mentioned computer programwith which parameter values for an equivalent circuit diagram of themachine 2 can be provided. This computer program can for example bestored in the Cloud 4 on a backend server 5.

In the present example it is assumed that neither the spare part imagenor the equivalent circuit diagram parameters of the machine 2 areknown. It can be assumed that the machine 2 is described for example bythe expanded equivalent circuit diagram EC3. The parameter values forthis equivalent circuit diagram can be determined for example with theaid of the above-mentioned form of embodiment of the method as describedbelow.

When the equivalent circuit diagram parameters of the machine 2 areknown, the IT environment 1 can be used for training a function F, forexample as described above. For this purpose for example the backendserver 5 can have a computer program with the corresponding commands.

First of all, using the machine 2, e.g. the asynchronous motor orgenerator, input data that is characteristic of the machine 2 iscollected in a state not connected to an operating voltage and can beentered as input into configuration application software.

This can be done by a user for example, who for example initiallycollects data relevant to the asset, e.g. to the machine, in particularto the asynchronous motor, in that he/she reads off specifications froma rating plate LS, which measures the shaft height of the asynchronousmotor 2. Above and beyond this the number of pole pairs can becalculated from the rating plate specifications, for example with themethod described above.

On setup of the asynchronous motor or generator 2, he/she, as part ofwhat is known as the onboarding, can enter the input data obtained intoa configuration App on a mobile device 6, e.g. smartphone/handheld.

The configuration App can transmit the input data over a data connection7, for example WLAN or GSM mobile radio, to the IoT Cloud 4, inparticular to the backend server 5.

The input data can also be stored in a database 8, wherein the database8 can be designed as a database of the Cloud platform 3 (shown here) oralso as a Cloud database of a third party (not shown here).

The computer program stored on the backend server 5 can access thedatabase 8.

The computer program subsequently accesses the input data andcreates/determines for the asynchronous motor 2 the associatedsimulation model EC3, i.e. the parameter values.

The method can be repeated for each new asset.

Subsequently, in an intermediate step, the information content of thesimulation model is reduced for reasons of information security. In thiscase the expanded equivalent circuit diagram EC3 with the parametervalues determined can be converted into a compressed or reducedequivalent circuit diagram.

The reduced equivalent circuit diagram has a smaller information contentthan the expanded equivalent circuit diagram. In the reduced equivalentcircuit diagram equivalent circuit diagram elements can be combined orremoved entirely. In this case, in the computation on the IoT device,the reduced information content is at least partly expanded again by(plausible) assumptions being made, which however are only applicable tothe individual motor—and not necessarily exact. Therefore the statementsabout operating behavior can be very restricted and merely restrictthemselves to torque and power.

The simulation model—equivalent circuit diagram EC3 with the parametervalues determined—can subsequently be stored for example in the platformdatabase 8 or on the backend server 5, in order—in the further course ofthe onboarding—to be able to be retrieved for the configuration App, orbe transmitted without intermediate storage to the configuration App.

After the configuration App has the simulation model available to it, itcan transmit the simulation model over a further, for exampleradio-based, data connection 9, e.g. Bluetooth or WLAN, to an IoT device10, which is arranged on the asynchronous motor 2, preferably fastenedto it.

The IoT device 10 can be embodied as a sensor apparatus, which isembodied and configured to create sensor data and to use the simulationmodel (equivalent circuit diagram EC3 or the reduced equivalent circuitdiagram with the parameter values determined), in order for example tocalculate from the sensor data with the aid of the simulation model dataof the current motor operating point or Asset KPIs (KPIs for KeyPerformance Indicators). A computing unit and/or a computer-readablememory medium (not shown here) can be provided for this in the IoTdevice 10.

The IoT device 10 is preferably not linked to any machine sensors within(or also outside) the machine 2. For the determination of the operatingbehavior described here (see e.g. description for FIG. 7 ) no expensiveand high-maintenance sensors, which can measure current or voltage forexample, are necessary. The IoT device 10 is therefore very low-cost andmaintenance-friendly. In this case for example a torque and/or a power,e.g. mechanical shaft power and/or a power factor and/or an efficiencycan be determined.

The computed asset KPIs (the operating behavior of the asynchronousmotor 2) can be transferred via a further preferably radio-based dataconnection 11, e.g. WLAN, for example at (time) intervals that can beset, to the IoT Cloud platform 3. There the asset KPIs can be subjectedto further IT processing or be stored in the database 8 or on thebackend server 5. Furthermore the asset KPIs can be displayed on adisplay facility arranged in the frontend of the IoT Cloud platform forexample, e.g. on a dashboard 12.

The data connections 7, 9, 11 are preferably all bidirectional.

In one form of embodiment (not shown here) transmission of thesimulation model to the IoT device 10 can be dispensed with. In thiscase the above-mentioned compression of the equivalent circuit can alsobe dispensed with, whereby better results can be obtained. Instead, thecalculation of the asset KPIs (of the operating behavior of theasynchronous motor or generator 2) can be relocated into the IoT Cloudplatform 3.

FIG. 7 shows a flow diagram of a form of embodiment of a methodmentioned cursorily above for determining the operating behavior of themachine 2 when it is put into service.

In a step A stray magnetic field outside the machine 2 is detected. In astep B a slip frequency f₂ and a synchronous frequency f₁ are calculatedfrom the stray magnetic field detected. In a step C a slip s iscalculated from the slip frequency f₂ and the synchronous frequency f₁.This can be done for example by means of signal processing software. Ina step D, as described above, an equivalent circuit diagram (theequivalent circuit diagram parameter values determined) is provided(e.g. by means of a data transmission from the mobile device 6). Theprovision of the equivalent circuit diagram by means of a datatransmission from a mobile device 6 preferably does not take placeduring the measurement or calculation sequence. Instead, the equivalentcircuit diagram can be transmitted during the onboarding and stored onthe HOT device.

In a step E, using the slip s, the synchronous frequency f₁ and theequivalent circuit diagram provided (the equivalent circuit diagramparameter values determined) the operating behavior of the machine 2 andin particular its operating point can be determined.

All of the steps A to C and E can be carried out for example by means ofthe IoT device 10.

It is however also conceivable for the IoT device 10 to merely carry outone or more of the steps A to C and for the rest of the steps to becarried out by another computing unit, e.g. a local server or by thebackend server 5. For example, the IoT device 10 can transfer straymagnetic field data to this computing unit for further processing andanalysis.

Thus an arrangement for determining the operating behavior of anelectric rotating machine 2 connected to an operating voltage cancomprise a sensor apparatus 10 and a processing facility, which areconfigured and interoperate in such a way that the steps A to E of themethod are carried out. The processing facility can for example comprisethe backend server 5, the mobile device 6, the database 8 and thedisplay facility 12 (see FIG. 6 ).

Although the invention has been illustrated and described in greaterdetail by the exemplary embodiments, the invention is not restricted bythe disclosed examples. Variations hereof can be derived by the personskilled in the art without departing from the scope of protection of theinvention as defined by the claims given below. In particular thedescribed method for provision of an equivalent circuit diagram can beimproved by features that are claimed with regard to the method forprovision of a trained function and vice versa. This applies mutatismutandis to the method for linkage of an electric rotating machine to aplatform, the method for determining the operating behavior of anelectric rotating machine connected to an operating voltage and to thearrangement for determining the operating behavior of an electricrotating machine connected to an operating voltage.

What is claimed is:
 1. A computer-implemented method for provision of atrained function, the method comprising: obtaining training input datacomprising shaft heights and a number of pole pairs, the training inputdata characteristic of an electric rotating machine, the training inputdata being collectable using electric rotating machines in a state inwhich the electric rotating machines are not connected to an operatingvoltage; obtaining training output data comprising loss and straycoefficients of the electric rotating machines representative ofparameter values that define simulation models of the electric rotatingmachines; training a function based on the training input data and thetraining output data; and providing the trained function.
 2. The methodof claim 1, wherein the function is based on a neural network, or on aregression.
 3. The method of claim 2, wherein the function is based on amultivariate regression.
 4. The method of claim 1, further comprisingpreprocessing a training dataset, which comprises the training inputdata and the training output data, before the function is trained on thetraining dataset.
 5. The method of claim 4, wherein the preprocessingcomprises bringing the training input data and the training output intoa relative and normalized form.
 6. A computer-implemented method forprovision of a simulation model of an electric rotating machine, thesimulation model defined by parameter values, the method comprising:obtaining input data comprising a shaft height, a number of pole pairsand rating plate specifications of the electric rotating machine, theinput data characteristic of the rotating electric machine, and theinput data being collectable using the electric rotating machine in astate in which the electric rotating machine is not connected to anoperating voltage; determining the parameter values from the input datawith the trained function provided by the method set forth in claim 1;determining with the trained function the loss and stray coefficientsbased on the shaft height and the number of pole pairs; determining theparameter values from the loss and stray coefficients and the ratingplate specifications; and providing the determined parameter values. 7.The method of claim 6, wherein the trained function is based on a neuralnetwork, or on a regression.
 8. The method of claim 7, wherein thetrained function is based on a multivariate regression.
 9. The method ofclaim 6, wherein the input data is subjected to a plausibility check.10. The method as claimed of claim 6, wherein the input data consists ofthe rating plate specifications.
 11. The method of claim 10, wherein atleast one part of the parameter values is defined by the rating platespecifications.
 12. The method of claim 6, wherein the input dataconsists of the shaft height and the number of pole pairs.
 13. Themethod of claim 6, wherein the simulation model is arranged as anequivalent circuit diagram.
 14. The method of claim 13, wherein theequivalent circuit diagram is an expanded equivalent circuit diagram.15. A computer program stored on a computer-readable medium, thecomputer program comprising commands that, when executed by a computer,cause said computer to carry out the method of claim
 1. 16. A computerprogram stored on a computer-readable medium, the computer programcomprising commands that, when executed by a computer, cause saidcomputer to carry out the method of claim
 6. 17. A data carrier signalstored on a computer-readable medium, that when transmitted, transmitsthe simulation model provided in accordance with the method of claim 6.18. A data carrier signal stored on a computer-readable medium, thatwhen transmitted, transmits the computer program of claim
 15. 19. A datacarrier signal stored on a computer-readable medium, that whentransmitted, transmits the computer program of claim
 16. 20. A methodfor linkage of an electric rotating machine to a platform, the methodcomprising: collecting input data using the electric rotating machine ina state in which the electric rotating machine is not connected to anoperating voltage, said input data comprising a shaft height, a numberof pole pairs and rating plate specifications of the machine, and saidinput the input data characteristic of the machine; entering the inputdata as input for configuration application software; transmitting theinput data to the platform with the configuration application software,wherein the platform comprises commands that cause the method of claim 6to be carried out by the platform in order to provide a simulation modelof the electric rotating machine.
 21. The method of claim 20, furthercomprising transferring the simulation model to the configurationapplication software, wherein the configuration application softwaretransmits the simulation model to a sensor apparatus arranged on themachine.
 22. The method of claim 21, wherein the sensor apparatus isfastened to the machine.
 23. The method of claim 20, wherein theplatform is a software platform.
 24. The method of claim 20, wherein theplatform is a cloud platform.
 25. A method for determining an operatingbehavior of an electric rotating machine connected to an operatingvoltage, the method comprising: detecting a stray magnetic field outsidethe machine; calculating a slip frequency and a synchronous frequencyfrom the stray magnetic field; calculating a slip from the slipfrequency and the synchronous frequency; providing the simulation modelaccording to the method of claim 6; and determining the operatingbehavior using the slip, the synchronous frequency, and the simulationmodel.
 26. The method of claim 25, further comprising determining anoperating point of the electric rotating machine based on the slip, thesynchronous frequency and simulation model.
 27. An arrangement fordetermining an operating behavior of an electric rotating machineconnected to an operating voltage, the arrangement comprising: aprocessing facility; a sensor apparatus embodied to detect a straymagnetic field outside the electric rotating machine and to calculatefrom the detected stray magnetic field a slip frequency and asynchronous frequency and to transfer the calculated slip frequency andsynchronous frequency to the processing facility; and the simulationmodel provided in accordance with the method of claim 6 stored on theprocessing facility, wherein the processing facility is configured,using the calculated slip frequency and synchronous frequency, todetermine a slip and subsequently to determine the operating behavior ofthe electric rotating machine by the simulation model.